Strain-insulator.



L. STEINBERGER.

STRAIN INSULATOR.

APPMGTIGN FILED MM 25111110.

1,01 1,652. Patented Dec. 12, 1911.

LoUIs 'srnmnnnenny or NEW YORK, N. Y.

STRAIN-INSULATOR.

Specification of Letters Patent.

Patented Dec. 1 2, 19.1.1

Application filed May 25, 1910. Serial No. 563,293.

T 0 all whom tt may concern:

Be it known that I, LoUIs STEINBERGER, a citizen of the United States, and a resident of the city of New Yorkborough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Strain-Insulator2 of which 1e tolloWing is a full, clear, and exact descv v'iption My invention relates to insulators or general use, and more particularly to a type of strain insulator suitable for service in- .connection with wiring, and subjected to comparatively high mechanical and electrical stress.

More specifically stated, my invention embodies a metallic member provided Awith an open central portion andl with annularends beveled internally and fitted with insulating sleeves of frusto-conical form, and strain members provided with frusto-conical heads fitted within these sleeves and adapted to be pulled Iin opposite directions; a mass of insulating material enveloping the-central inetallic member, the sleeves, and part of the strain members.

Referenceis to be had to the accompanying drawingsforming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure l is a central section through my improved strain insulator showing the relative arrangement ot' the central metallic link, the frusto-conical sleeves mounted therein, the metallic bolts and their accompanying parts extending into the sleeves, and a mass of insulating material provided externally with corrugations and molded around the entire structure except the outer ends of the bolts; Fig. 2 is a vertical cross section upon the line 2-2 of Fig. l looking in the direction of the arrow, and showing in cross section the mass of insulating material and also the central bars connecting the rings ot' the link together; Fig. 3 is a central cross section through the link, provided at its ends with rings and frusto-conical sleeves, this View. further showing the metallic members mounted within the sleeves; Fig. 4 is a perspective showing the link complete, includ ing the rings connected together by the central bars; and Fig. 5 is a perspective of one of the frusto-conical sleeves.

Two rings 6 of massive construction, are

made of metal and are each provided inter-` nally with a beveled or tapered surface 7, as will be understood from Figs. 3 and el. Such being the case, each ring G is thicker and more massive toward its ends than toward the center. The rings G are connected together by center bars 8 integral therewith, each of these center bars having a cross section of the kind indicated in Fig. 2.

lnsulating sleeves 9, l0, of trusto-conical form are fitted into the rings 6, in suchmanner that the small'ends of the sleeves extend in opposite directions. A nut 1l, of frustoconical form,`is provided with a smooth exterior that tits neatly against the inner surface of thesleeve 9. A bolt 12 is provided with an eye 13, and is further provided with a shoulder lil, and with a threaded portion l5, all of these parts being integral. The nut 11 is threaded internally and fitted upon the threaded portion 15 of the bolt 12. lVhen screwed firmly into position, the nut 11 locks tiglitly against the shoulder 1l, so as to be held firmly in position relatively to the bolt. The nut l1 is provided with holes 16 and the threaded portion 15 is provided with a slot 1T. The holes 16 are used to facilitate the application ot a wrench. and also serve as anchorage. The slot 1T is also for the purpose ot aitording anchorage for the insulating material with which the link is afterward fitted, as hereinafter described.

A. frusto-conical head 18, provided with a. smooth exterior, tits neatly against the inner surface ot' the sleeve l0, and is provided with holes lf) and with a stem Q() and a clevis 21, the latter and the stem Q0 being ii'itegral with the head 1.8. The clevis is provided with holes Q2, the head 18, stein 20, and clevis Q1 together constituting a strain meniber. Similarly the nut 11 and bolt 12 together constitute the opposite strain member.

At Q3 is shown a mass of insulating material. which in a plastic state is molded into and around the link so as to envelop it together' with all parts'connected with it., except a portion of the bolt 1Q, its eye 13, and the stem 20 with its clevis 21, as iwill be 'understood from Fig. 1.

' In assembling the parts above described, the entire link shown in Fig. 4 is produced in any suitable manner, and the sleeves 9, 10, are let into it from the center; next the nut 1 1 is passed into the sleeve 9 from the center.; the bolt 12 may be connected with the nut l1 asthe latter is inserted, or after- Ward if desired. The head 18 is next inserted from the center', Ithe clevis 21 being tirst passed through the sleeve 10', and the parts being in this position the nut 11 andL the head 18 are drawn in opposite directions so as to tittightly in position, the parts now assuming the form indicated in Fig. 3. The plastic material is neXt filled into and around the link, and provided with corrugations 2li, as indicated in Figs. 1 and 2.

ln some instances I may deein'it proper not to use the plastic material 23, and in such event the strain insulator as finished, will appear as indicated in Fig. 3. lV hen used in this torni the parts may be readily assembled or disassembled at will., whereas it' the insulating material be applied as indicated in Fig. l, the structure becomes to all intents and purposes practically integral therewith, and no part can readily change its position relatively to any other part.

l do not limi-t myself to the use oi: any particular insulating material for the construction above described, .but'pret'er in practice to employ the material well known in' the art as electr-ose. Neither do l limit myself to the particular combination shown nor to the exact forni of any or all,

lending said vsleeves and' fitting the same.

Q ;Ai strain insulator comprising a pair of rings connected togetherby center bars integraltherewith, said rings being provided with openings tapering in diameter,

'each ring being thicker where boundedby the outermost portions of said openings, sleeves of insulating material mounted Within said openings and each having generally a truste-conical form, and strain members extending into said sleeves'and provided with portions of frusto-conical form engaging said sleeves. i

Il. A strain insulator rcomprising a pair oi metallic rings connected ytogether by center bars integral therewith, one of said rings being more massive at its outer end than toward its center, and having an opening ot 'tapering diameter, a truste-conical sleeve mounted within said opening, a strain member provided with av portion of frustoconical form fitted into said sleeve, and mechanism for engaging the other of said rings.

l. A strain insulatorcomprising a` body portion of metal provided with an opening, a sleeve of' insulating material mounted within said opening, a head disposed within said sleeve, a stem extending from said head, a clevis upon said stem, said clevis being ot' sutliciently. small diameter to pass through said sleeve, and mechanism for supporting the opposite end .of said body portion of metal. f y

In testimony whereof I have signed my name to this specilication in the presence ol' two subscribing witnesses.

LOUIS STEINBERGER.'

ll'ilnesses:

A. H. Dwis, liilLIr l). Ili'JLLiIAUS. 

